In a previous version, I used KeyUpEvent but in Beta3, it wasn't supported at all, even though it worked with plain GWT TextBox component. With TextField, Enter made the focus to go elsewhere, and I had to click again in the field to make Enter to work.
KeyPressEvent worked well, so I went with it.

We upgraded to Beta4 and it stopped working. I can see the typed chars in event.getNativeEvent().getCharCode() and the Tab char I use to jump between fields in event.getNativeEvent().getKeyCode(), but this method isn't called for Enter at all.

So, is this a bug? Do I need to call some method to enable Enter to work? I believe this is important for usability.

Side note: the TextButton doesn't seem to take focus, so I can't hit Tab and hit Enter on it to validate the form. I would appreciate a hint to make a Button to take focus too.